Influence of the stress path on dilatancy of soils and its modeling

One of the most important characteristics of soil is itsdilatancy in which plastic volumetric strain occurs during shearing. Theinfluence of stress path on the dilatancy of soils is systematicallyanalyzed in this paper with the asymptote state model proposed by authors etal (Luo et al, 2009), in which the part coupling effect between the plasticvolumetric strain and plastic shear strain is assumed firstly. Thecomparisons are carried out between the test results of the dilatancy andthe model predictions of the original Cam-Clay model, the modified Cam-Claymodel, the unified hardening model (Yao et al, 2008) and our proposed model.The comparisons results demonstrate that the asymptote state model candescribe the effect of the stress path on the dilatancy of soils in a betterway in the stress-strain and strength behaviors of soils.